New tetradentate Schiff bases, their oxovanadium(IV) complexes, and some complexes of bidentate Schiff bases with vanadium(III)

Article abstract of DOI:10.1016/S0277-5387(96)00436-6

New vanadyl(IV) complexes of tetradentate Schiff-base dianions containing one, two or three carbon atoms between the two iminato-nitrogen atoms are described. The compounds are either mononuclear or polymeric, as shown by the value of v(V = O), and depending upon the Schiff-base dianion. There is no evidence for electron delocalization along the polymeric chains. Some vanadium(III) complexes of bidentate Schiff-base monoanions have also been isolated; the crystal structure of [VO(2-OC₆H₄CHNH)₂] and preliminary data on the structure of [V(Prhap)₃] · toluene [HPrhap = 2-HOC₆H₄C(Me)NCH₂CH₂Me] are reported.